SUM 41 has canceled its co-headlining appearance at Australia’s Good Things festival due to singer Deryck Whibley‘s battle with pneumonia. The band has also scrapped the remaining sideshows on its Australian tour.

“It is with deep sadness and regret that we announce our 2024 Australian tour is unable to proceed,” SUM 41 wrote on social media. “We were beyond excited to deliver this tour from December 4 – December 12, and connect with our Aussie fans once more. Now that we’re here though, and under the guidance and direction of multiple Australian doctors, it’s clear that Deryck is too unwell to perform. We understand and appreciate your disappointment — we’re gutted too.”

The band added: “The good news is Good Things Festival is still going ahead in Melbourne, Sydney and Brisbane this weekend with an incredible line-up of local and international acts. We can’t be there, but get along for us and have the best time.”

On Wednesday (December 4), the Canadian punk rockers canceled their sideshow at Brisbane’s Fortitude Music Hall due to Whibley‘s diagnosis.

“Unfortunately, we have to make the difficult decision to cancel tonight’s show in Brisbane due to Deryck being diagnosed with pneumonia,” the band said in a statement. “He is receiving the best possible local care.”

Good Things festival shared its own statement, writing: “Good Things is set to hit Brisbane, Melbourne and Sydney this weekend, with a slight tweak to the lineup. Under the guidance and direction of doctors in Australia, it has become clear SUM 41‘s Deryck Whibley is too unwell to perform. SUM 41 are gutted they can’t perform, and we fully understand and appreciate fans’ disappointment. Deryck‘s health and wellbeing is the focus and priority though, and we hope you will join us in sending him well wishes for his recovery.”